you're definitely at a good starting place. you're lines are very clean and the shading on the hair is well done. i'd suggest trying out some different angles but i'll leave it to the more experienced members to say more

Alright i'm just gonna go over the most obvious problems in your drawings. The necks are too wide. Generally, the necks on girls are thin and slender to make them look cute Secondly, the chins/jawlines are too wide or aren't correct when compared to the rest of the head These are problems that will go away if you are diligent with practicing

It looks as if you're using a pen; i'd suggest using pencils for planning out the structures first.

Thanks for posting your drawings ! First one looks great and second and third has little errors which Nexuun. But the Big fact is you are on right track ! Little bit more practice and your skills will get perfect !

But then comes the harder parts. Drawing full body characters. It can become a real pain getting all limbs and poses all correct but it can be done. ( I'm still working on it too > < )

Check our Drawing workshops and why don't you take part those too ? xD